Machine fob grinding file-blanks



ROBERT G. PINE, OF

NEWARK,

NENV JERSEY.

MACHINE FOR GRINDIN'G FILE-BLANKS.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, R. G.. PINE, of Newark, in the county of Essex and State of New Jersey, have invented a new and use-v ful Machine for Grinding File-Blanks and other Articles Having a Regular Curved Form; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1, is a longitudinal vertical section of my improvement; Fig. 2, showing the plane of section. Fig. 2, is a plan or top view of the same.

Similar letters of reference indicate corresponding parts in the two figures.

My invention consists in the employment or use of a reciprocating frame in which the file blank, or other articles to be ground, and patterns are placed, the guides of said frame being attached to a frame which is rendered self-adjusting by a peculiar device or arrangement of parts as will be hereinafter fully shown and described, whereby the file blanks are fed to a grind stone as the diameter of the stone diminishes by wear and the file blanks perfectly presented to the stone by the patterns so that the blanks will be ground in proper form.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents a rectangular frame constructed in any proper manner to support the working parts.

B, represents a driving shaftplaced on one end of a frame A1. This shaft has a driving pulley C, placed on one end, and a crank D, is placed at t-he center of said shaft. The frame A1, has a guide rod a, at each side and a frame E, is fitted or works on the rods a, a.

The bearings b, b, of the frame E, which bearings work on the rods a, a, have vertical pins c, attached to them, one to each and these pins have each a spiral spring f, on them, the springs bearing against the upper surface of the frame E, and against the heads or nuts of the pins c, as shown clearly in Fig. 1.

In the frame E, there are placed three parallel bars g, g, h, which are slotted longitudinally. In the slot of the center bar L, the file blank z', is secured, shown in red, and in the slots of the other bars g, g, patterns 16,552, dated February 3, 1857.

j, y', are secured, the patterns corresponding in form to that intended for the file blank. The patterns y', j, rest or bear upon rollers 1,70, placed in the frame A1, and the file blank z', rests or bears upon a grind stone F, which is placed on a shaft G, having its bearings on the upper part of the frame A. The frame E, is connected with the crank D, by a rod or pit-man I-I.

The frame A1 has four pendents or projections Z, attached to its under surface, two at each side, and each pendent is pivoted to the upper end of a bent lever m, the levers m, being pivoted at n, to the upper part of the frame A. The lower ends of the levers m, at each side of the frame A, are pivoted to bars I, and to the center of each bar I, an arm J, is pivot-ed the upper ends of said arms being fitted loosely on a shaft K, the bearings o, of which are placed in grooves or slots p, in the sides of the frame A, so that said bearings are allowed a forward and backward movement in the frame.

On the shaft K, a roller L, is placed, said roller bearing against the grind stone F, as plainly shown in Fig. 1.

The grind stone shaft Gt," is driven by a belt from the pulley C.

The file blanks are forged rolled or swaged to a form approximating the intended one, and one or more being secured in the slot of the bar h, a reciprocating motion is given the frame E, by rotating the shaft B, and as the frame E, moves backl` and forth, the frame E, and consequently the file blank will be raised and lowered by the patterns y', j, and springs f, so that the blank will be ground by the stone in proper form, corresponding to the patterns. This will be readily understood, but it will be seen that in order to have the above device work perfectly the frames E, A1. must gradually descend because the stone is gradually though slowly decreasing in diameter by wear, and if some compensating device were not employed, the stone would soon cease to act upon the blank. This diiiiculty is obviated by connecting the frame A1, with the levers m, bars I, and shaft K, as shown, for the roller L, on the shaft K, bears against the periphery of the grind stone F, and sustains the frames E, A1, the roller being kept against the stone by the weight of the frames, consequently as t-he stone wears, the shaft K moves toward it and said shaft moves the arms J, the bars moving the bars I, and levers m, so that the frames are gradually depressed and the blank kept in contact with the stone F, at all times.

The blanks may be so fixed in the bar L, that they may be turned and the different sides presented to the stone.

The above machine is simple, may be constructed at a moderate cost and there are no parts liable to get out of repair.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is

1. Y'Ihe reciprocating frame E, attached to the frame A1, as shown, and having springs f, connected With it, When said 15 frame is used in connection With the grind stone F, and patterns j, j, for the purpose specified.

2. I claim attaching the frame A1, to the levers m, barsv I, and shaft K, having the 20 roller L, upon it, said parts being arranged as shown or in an equivalent Way for the purpose Set forth.

ROBERT G. PINE.

Witnesses JAMES F. BUCKLEY, S. F. COHEN. 

